<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="../../vue.js"></script>
</head>

<body>
  <div id="app">
    {{name}}
  </div>

</body>
<script>

  var user = {
    name: 'zhangsan',
    age: 18
  }

  Object.freeze(user);
  var vm = new Vue({
    el: '#app',
    data: user,
    hello() {
      console.log('hello')
    }
  })



</script>

</html>